Test variable (independent variable): The location of crustal plate boundary- This variable is intentionally manipulated by the researcher to explore the different interactions between continental and oceanic tectonic plates at various locations.
Outcome variable (dependent variable): Geological features and events that occur at each location- This variable is observed and measured to see the impact of the different crustal plate boundary locations on the geological features and events.
Control group: There is no specific control group mentioned in the given scenario. However, if there is a comparison between different locations, one of them could serve as a control group against which the other locations are compared to determine the differences in geological features and events.